Below is a sample of the variation in spotted thrush contact and alarm calls commonly heard during both spring and fall migration.
Veery: Veery showcase an especially wide range of contact calls. Clearer call notes heard here: http://www.xeno-canto.org/253570. Here, huskier calls are heard; this call is more similar to that of the nocturnal call of the Rose-breasted Grosbeak: http://www.xeno-canto.org/149631. Another variation: http://www.xeno-canto.org/87310. And another: http://www.xeno-canto.org/292261. Very clear down-slurred whistle call: http://www.xeno-canto.org/87305
Hermit Thrush: The “towhee call”, which is a scratchy, nasally wheeer, is most commonly heard on this species’ breeding grounds, but is also heard during migration http://www.xeno-canto.org/369851. The most commonly heard call during migration is the chup call: http://www.xeno-canto.org/297694. Another example of the chup call: http://www.xeno-canto.org/340706. Occasionally, an individual will utter the call that is most often heard during nocturnal flight; a clear, down-slurred whistle: http://www.xeno-canto.org/211200
Swainson’s Thrush: The nasally werr and whip-werr calls are, like in Hermit Thrush, most common as a breeding ground fixture. They are also heard during migration: http://www.xeno-canto.org/355191. The most commonly heard call during migration is the whip call. Several times over the years I have pished a migrant Swainson’s into view and had it perch in cover, giving this call: http://www.xeno-canto.org/336951
Gray-cheeked Thrush: Vocal during night flight, and often heard calling at dawn through until just after sunrise, but generally silent during the day. The most commonly heard call is a high-pitched, descending peeoo or pee-u: http://www.xeno-canto.org/317125 and http://www.xeno-canto.org/67146
Wood Thrush: Wood Thrush have a variety of alarm calls. This soft, bubbly call is often given by breeders and migrants alike: http://www.xeno-canto.org/9457. When agitated or spooked, birds often utter a loud, whipping whit-whit-whit call: http://www.xeno-canto.org/334618